I received anal sex six days ago and immediately began feeling cramping and bloating and then diarrhea and constipation. I've been this way for six days straight. Is this normal? Does it suggest I may have an underlying condition like IBS and I should stay away from anal sex. It does not happen all the time but it has happened about two times. Should I see a doctor? What kind of Doctor? I am a male. I normally do not have issues with my stomach.